| 摘要 |
PURPOSE:To obtain a developer which is suitable for wet or half-dry diazo copying and provides a colored image having always a specified high density by dissolving a liquid org. amine in a solvent of hydrocarbon or a solvent mixture composed of oil and halogenated hydrocarbon solvent. CONSTITUTION:A solvent mixture which dissolves a specific org. amine but does not dissolve the essential component and forming dye in a photosensitive layer is prepd. by mixing (A) a solvent or oil of hydrocarbon base (e.g.; isopropyl benzene, kerosene) and (B) 0.5-10wt% halogenated hydrocarbon solvent (e.g.; dichloropentane, p-chlorotoluene) basing on the weight of the component (A). A liquid org. amine (e.g.; n-hepthyl amine, 2-ethylhexylamine) is dissolved in the resulting solvent mixture, whereby an intended developer for diazo copying is obtd. The resulting developer obviates the contamination of the developer and the base texture of a copy, the discoloration in the dyed image, etc. |
